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Abstract
We carried out the de Haas–van Alphen (dHvA) experiment for an antiferromagnet CeRhIn 5 under high pressures up to 3 GPa. The main dHvA branches α i and β 2 at ambient pressure, which are well explained by Fermi surfaces of LaRhIn 5, are unchanged up to about 2.4 GPa. Above 2.4 GPa, new dHvA branches appear, which are in good agreement with the corresponding dHvA branches of a 4f-itinerant heavy fermion superconductor CeCoIn 5. These results indicate that the 4f-electronic state is changed from localized to itinerant at a critical pressure P c ≃ 2.4 GPa .
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